Bulletin No. 1[-3]: (May 1, 1918) The enemy submarine. Comp. by the Naval consulting board and War committee of technical societies from information already published and other recently released
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aeroplanes aircraft Anti-submarine nets apparatus armor batteries battleships bomb bottom coast defense compressed air conning tower construction convoys cruisers deck Decreasing the Visibility deflecting depth depth charges designed destroy destroyers detecting the presence diaphragm dirigible distance Dreadnought efficient electric motor electrical enemy submarine enemy's equipped experimented explosion feet Floating German submarines guns gyroscopic heavy charge hostile submarines hull increased Inst internal combustion engines inventions inventor knots listening devices magnetic effect marine means merchant merchantmen methods miles mines modern submarine motor Naval Consulting Board Navy nets observer offensive patrol for submarines pedo periscope fair-water phosphorus practicable present proposed protection range rines seaplanes shell ship small submarine smoke sound waves storage subma submarine attack submarine chasers submarine is usually submarine operated submerged submarine submerged tubes submersibles suggested tactics tion tons torpedo attack towed trawlers and submarine U-boat undersea boat underwater vessels vibrations watertight wireless